20926642 has 16 divisors (see below), whose sum is σ = 35733312. Its totient is φ = 9098320.

The previous prime is 20926639. The next prime is 20926663. The reversal of 20926642 is 24662902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20173 + ... + 21184.

It is an arithmetic number, because the mean of its divisors is an integer number (2233332).

Almost surely, 2^20926642 is an apocalyptic number.

20926642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20926642 is a deficient number, since it is larger than the sum of its proper divisors (14806670).

20926642 is a wasteful number, since it uses less digits than its factorization.

20926642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41393.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20926642 is about 4574.5646787427. The cubic root of 20926642 is about 275.5707902053.

The spelling of 20926642 in words is "twenty million, nine hundred twenty-six thousand, six hundred forty-two".